package com.childenglish.service;

import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import java.util.HashMap;
import java.util.Map;

@Service
public class SpeechRecognitionService {

    /**
     * 语音识别处理
     */
    public Map<String, Object> processSpeech(MultipartFile audioFile) {
        Map<String, Object> result = new HashMap<>();

        try {
            // 输入验证
            if (audioFile == null || audioFile.isEmpty()) {
                result.put("status", "error");
                result.put("message", "音频文件不能为空");
                return result;
            }

            // 文件类型验证
            String contentType = audioFile.getContentType();
            if (contentType == null || !contentType.startsWith("audio/")) {
                result.put("status", "error");
                result.put("message", "不支持的文件类型，请上传音频文件");
                return result;
            }

            // 文件大小限制 (10MB)
            if (audioFile.getSize() > 10 * 1024 * 1024) {
                result.put("status", "error");
                result.put("message", "文件大小不能超过10MB");
                return result;
            }

            // 模拟语音识别处理
            String text = "Hello, how are you today?";
            double confidence = 0.85;

            result.put("text", text);
            result.put("confidence", confidence);
            result.put("duration", audioFile.getSize() / 1000.0);
            result.put("status", "success");
            result.put("fileName", audioFile.getOriginalFilename());
            result.put("fileSize", audioFile.getSize());

        } catch (Exception e) {
            result.put("status", "error");
            result.put("message", "语音处理失败: " + e.getMessage());
        }

        return result;
    }

    /**
     * 发音评估
     */
    public Map<String, Object> evaluatePronunciation(String text, MultipartFile audioFile) {
        Map<String, Object> result = new HashMap<>();

        try {
            // 输入验证
            if (text == null || text.trim().isEmpty()) {
                result.put("status", "error");
                result.put("message", "评估文本不能为空");
                return result;
            }

            if (audioFile == null || audioFile.isEmpty()) {
                result.put("status", "error");
                result.put("message", "音频文件不能为空");
                return result;
            }

            // 模拟发音评估
            result.put("score", 85);
            result.put("accuracy", 0.88);
            result.put("fluency", 0.82);
            result.put("completeness", 0.90);
            result.put("feedback", "发音不错，继续努力！");
            result.put("words", new String[]{"hello", "how", "are", "you"});
            result.put("status", "success");
            result.put("text", text);
            result.put("audioDuration", audioFile.getSize() / 16000.0); // 模拟时长计算

        } catch (Exception e) {
            result.put("status", "error");
            result.put("message", "发音评估失败: " + e.getMessage());
        }

        return result;
    }

    /**
     * 获取支持的音频格式
     */
    public Map<String, Object> getSupportedFormats() {
        Map<String, Object> formats = new HashMap<>();
        formats.put("supportedFormats", new String[]{
                "audio/wav", "audio/mpeg", "audio/mp3", "audio/ogg", "audio/webm"
        });
        formats.put("maxFileSize", "10MB");
        formats.put("maxDuration", "300s"); // 5分钟
        return formats;
    }
}